Instructions for Use and Installation Backflow Preventer and Boiler Feed Valve (PRV) SUPERSEDES: September 1, 2014 EFFECTIVE: September 1, 2015 Plant ID# 001-3942 102-371 A – 1 /4" NPTF H – 4.5" A1 – 1 /2" NPTF h – 3.3" L – 3.5" A1 A1 L A h H 2.0" (51 mm) removal space Spare Parts Breakdown: 1 2 3 4 LIMITED WARRANTY STATEMENT Taco, Inc. will repair or replace without charge (at the company’s option) any product or part which is proven defective under normal use within one (1) year from the date of start-up or one (1) year and six (6) months from date of shipment (whichever occurs first). In order to obtain service under this warranty, it is the responsibility of the purchaser to promptly notify the local Taco stocking distributor or Taco in writ- ing and promptly deliver the subject product or part, delivery prepaid, to the stocking distributor. For assistance on warranty returns, the purchaser may either contact the local Taco stocking distributor or Taco. If the subject prod- uct or part contains no defect as covered in this warranty, the purchaser will be billed for parts and labor charges in effect at time of factory examination and repair. Any Taco product or part not installed or operated in conformity with Taco instructions or which has been subject to misuse, misapplication, the addi- tion of petroleum-based fluids or certain chemical additives to the systems, or other abuse, will not be covered by this warranty. If in doubt as to whether a particular substance is suitable for use with a Taco product or part, or for any application restrictions, consult the applicable Taco instruction sheets or contact Taco at [401-942-8000]. Taco reserves the right to provide replacement products and parts which are substantially similar in design and functionally equivalent to the defective product or part. Taco reserves the right to make changes in details of design, construction, or arrangement of materials of its products without notification. TACO OFFERS THIS WARRANTY IN LIEU OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTY IMPLIED BY LAW INCLUDING WAR- RANTIES OF MERCHANTABILITY OR FITNESS IS IN EFFECT ONLY FOR THE DURATION OF THE EXPRESS WARRANTY SET FORTH IN THE FIRST PARAGRAPH ABOVE. THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR STATUTORY, OR ANY OTHER WARRANTY OBLIGATION ON THE PART OF TACO. TACO WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDI- RECT OR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF ITS PRODUCTS OR ANY INCIDENTAL COSTS OF REMOVING OR REPLACING DEFECTIVE PRODUCTS. This warranty gives the purchaser specific rights, and the purchaser may have other rights which vary from state to state. Some states do not allow limitations on how long an implied warranty lasts or on the exclusion of inci- dental or consequential damages, so these limitations or exclusions may not apply to you. Dimensions: 1 Backflow Cartridge Service Cap 3450-002RP 2 Backflow Preventor Cartridge 3450-001RP 3 Pressure Reducing Cartridge 3350-005RP 4 Wrench (not included with the valve purchase) 3450-003RP wrench or other tool. Do not over tighten. Close the previ- ously opened drain, open the isolating valves and test per local requirements. Backflow – Close the isolation valves located on both sides of the 3450 Combination Valve and open the drain at the upstream (inlet side) isolating valve. The backflow cartridge is located beneath the black service cap. In order to remove the cap on the combination valve use the cap/cartridge wrench (purchased separately) or other user provided tool. Place the wrench over the 6 point star on the cap and turn counterclockwise to loosen, remove the cap. A spring is located behind the backflow cartridge that may push the car- tridge out of the body when the cap is removed. Take care not to lose the spring. If the cartridge remains in place with the cap removed, pull it out. With the spring in place put the new cartridge into the body. Using the 4 fingers on the ser- vice cap, push the cartridge into the body and turn the ser- vice cap clockwise until hand tight, fully tighten using the wrench or other tool. Close the previously opened drain, open the isolating valves and test per local requirements. Cartridge Replacement: Note: When purchasing a replacement backflow or PRV cartridge, Taco recommends also purchasing the wrench in order to simplify removal and replacement of either part. PRV – Close the isolation valves located on both sides of the 3450 Combination Valve and open the drain at the upstream (inlet side) isolating valve. Loosen the cartridge in the combination valve by placing the wrench (pur- chased separately) or other user provided tool over the 8 point cam nut and turn counterclockwise. Unscrew the cartridge and remove it from the body. Install the new cartridge hand tight. Fully tighten it using the cartridge Application: Taco’s combination Backflow Preventer and Boiler Feed Valve (PRV) is designed for use in today’s Hydronic heating systems to protect against possible water contamination from the heating system water flowing back into the potable water supply. The combination valve is suitable for systems with fill pressure requirements between 10-50 PSI. The Boiler Feed Valve (PRV) reduces incom- ing pressure and automatically maintains that system pres- sure to the valves adjustable pressure set point. The Taco combination valve showcases a fast fill button with automatic reset, this allows the valve to automatically return to maintaining the adjusted pressure setting once the system is full and the set pressure is reached. No more manually holding the valve open or locking it in an open position and over pressurizing to the point of setting off the relief valve. The integral Backflow Preventer pre- vents the back flow of non potable heating system water into the Potable water supply. Technical Specifications: Connections 1/2" x 1/2" Maximum Inlet Pressure 150 psi Minimum Delta P Inlet to Outlet 15 psi Recommended Setting Range 10-50 psi +/-3 psi Factory Setting 12 psi Adjustment Capability 8.5 - 65 psi Maximum Flow Rate(velocity) 25 gpm (8 ft / sec) Mounting Position Horizontal Flow with Atmospheric Vent toward the floor Maximum Temperature 210°F